P.F. Strawson famously argued that reactive attitudes and ordinary moral practices justify moral assessments of blame, praise, and punishment. Here we consider whether Strawson's approach can illuminate the concept of desert. After reviewing standard attempts to analyze this concept and finding them lacking, we suggest that to deserve something is to justifiably receive a moral assessment in light of certain criteria – in particular, eligibility criteria (a subject's properties that make the subject principally eligible for moral assessments) and assignment criteria (...) (particulars about the subject, act, and circumstances that justify assessments such as blame in a particular case). Strawson's analysis of the ordinary attitudes and practices of moral assessment hints at these criteria but does not unequivocally ground a notion of desert. Following Strawson's general naturalistic approach, we show that recent psychological research on folk concepts and practices regarding freedom, moral responsibility, and blame illuminates how people actually arrive at moral assessments, thus revealing the very eligibility criteria and assignment criteria we suggest ground a concept of desert. By pushing the Strawsonian line even further than Strawson did, by empirically investigating actual moral practice and folk understandings, we can illuminate desert and lend credence to Strawson's general anti-metaphysical position. (shrink)